OPERATOR’S MANUAL
66523-B
RELEASED:
REVISED:
(REV. D)
1-21-00
8-1-11
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE.
8” AIR MOTOR
6” Stroke
Also covers 66614 service kits.
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
It is the responsibility of the employer to place this information in the hands of the operator. Keep for future reference.
6
3
5
4
2
30 29
34 45
SERVICE KITS
Use only genuine ARO® replacement parts to assure compat-
ible pressure rating and longest service life.
66614 for general repair of 66523-B air motor.
90350 installation tool is recommended for repair of 66523-B
air motor.
DISASSEMBLY
NOTE: All threads are right hand.
1. Force the (43) piston assembly up by pushing toward the top
of the air motor (see figure 4).
2. Remove six (1) screws, releasing the (31) cap and (32) gasket.
3. Loosen the eight (45) screws, which hold the (33) valve plate
and pin assembly, (30) valve guide, two (4) valve guides and
the (5) valve plate, until the (30) valve guide and the two (4)
valve guides can be removed by pulling upward (see figures 1
and 2).
45 46
33 28 46
47
48
7
(Use an Allen wrench to push out screws and washers as shown.)
Figure 2
Allen Wrench
13. Remove the (8) upper washer and the (9) “U” cup packing from
the (10) piston adapter.
14. Remove the six (22) nuts and (23) bolts.
46 Washer (8)
45 Screw (8)
(The remaining four
washers and screws are
on the opposite side.)
2
10
Figure 1
4. Remove the eight (45) screws and the eight (46) washers from
the 8”air motor by pressure outward with a small Allen wrench
(see figure 1).
5. Using a screwdriver, unhook the (28) insert spring assembly
from the bottom of the (33) valve plate and pin assembly (see
figure 2).
6. Remove the (28) insert spring assembly from the pins in the
top of the (33) valve plate and pin assembly.
7. Pull the (2) valve piston upward until the (7) upper gland has
pulled out of its chamber.
8. Remove the (7) upper gland.
9. Remove the (39) seal, (38) “O” ring and the (13) “O” ring from
the (7) upper gland (see figure 7).
10. Disassemble the (2) valve piston from the (10) piston adapter
(see figure 3).
11. Remove (2) valve piston.
Figure 3
15. Remove the (35) head assembly and place on the workbench,
with the end that the tube fits in, up.
16. Remove the (16) “O”ring from the (35) head assembly.
17. Remove the four (40) screws, releasing the (41) lower gland.
18. Remove the (12) lower washer and (13 and 42) “O” rings from
the (41) lower gland.
19. Remove (44) tube.
20. Remove the “O”ring from the (44) tube.
21. Pull upward on the (18) air cylinder until the (43) piston as-
sembly separates from the (26) air motor base assembly. If the
(43) piston assembly is not pulled from the (26) air motor base
assembly, remove it after removing the (18) air cylinder.
22. Remove the (16) “O” ring from the (26) air motor base and
bearing assembly.
12. Pull the (10) piston adapter upward and grasp the (11) exten-
sion rod below the (10) adapter. Push the (10) piston adapter
down on the (11) extension rod. Remove the (37) washer and
(11) extension rod.
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
(800) 495-0276 FAX (800) 892-6276
© 2011
CCN 99834871
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PARTS LIST / 66523-B
37
7
� 49
39
13
38
8
9
45 46 47, 48
6
5
3
2
29 30 31 32
1
28
33
34
35
4
� 10
11
13
12
41
36
16
17
� 14
43
40
42
� 19
18
23
16
44
36
21
24
26
22
25
Apply Loctite 271 to threads.
Figure 4
66523-B (en)
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27. Place the 90350 installation tool over the (11) extension rod,
with the turned diameter down and the chamfer up.
28. Fit the turned diameter of the 90350 installation tool into the
bore in the bottom of the (35) head assembly.
29. Place the (10) adapter down over the (11) extension rod, with
the threads upward.
18 Cylinder (apply
grease throughout
inside)
30. Insert the (37) washer into the groove in the top of the (11)
extension rod.
31. Pull the (10) adapter up and around the (37) washer.
32. Place the (8) upper washer over the (11) extension rod and
onto the (10) adapter.
33. Clean the threads with solvent and put Loctite 271 on the
threads of the (2) piston. Screw the (2) piston into the (10)
adapter and tighten (see figure 3).
17 “O” Ring (apply
grease around“O”
ring)
34. Push the assembled (10) adapter and (2) piston down through
the 90350 installation tool until they bottom.
35. Remove the 90350 installation tool.
43 Piston
Figure 5
36. Install the (7) upper gland over the (2) piston and push down,
being careful to retain the (39) seal in the “O”ring groove.
37. Align the two bolt holes and secure the (7) upper gland to the
(35) head assembly with the two (47) screws and two (48) lock
washers (see figure 2).
38. Insert the (28) spring in the (35) head assembly, with the hooks
down and the nylon roller toward the (2) piston (see figure 2).
39. Thoroughly grease and insert the (3) pilot insert, two (4) valve
guides, (5) valve plate and (6) gasket into the (35) head assem-
bly (see figure 2).
23. Bend the (39) seal in a heart shape and install in the (7) upper
gland inside the (38) “O”ring (see figure 6).
40. Thoroughly grease and insert the (29) valve insert into the (35)
head assembly (see figure 2).
41. Thoroughly grease and insert the (34) valve plate gasket and
the (33) valve plate and pin assembly between the insert and
the (35) head assembly, with the two pins in the (33) valve
plate up (see figure 2).
42. Hook the round coils in the (28) insert spring assembly over
the pins in the (33) valve plate and pin assembly (see figure 2).
43. Hook the bottoms of the (28) insert spring assembly into the
holes on the side of the (33) valve plate and pin assembly (see
figure 2).
Seal Free Form
Seal Collapsed Form
Push sides in, as shown, then slide into bore and position seal in groove.
Figure 6
24. Grease and carefully push the (2) piston into the (7) upper
gland to size the (39) seal and remove (see figure 7).
44. Insert the (30) valve guide against the face of the (33) valve
plate and pin assembly. The legs of the (30) valve guide should
be down, with the leg having the threaded hole the farthest
from the bottom toward the air inlet in the (35) head assem-
bly.
45. Insert and tighten across corners the eight (45) screws and
eight (46) washers (see figure 1).
46. Thoroughly grease and install the (32) gasket in the (31) cap.
47. Place the (31) cap on the (35) head assembly and secure with
six (1) screws (see figure 4).
13 “O” Ring
38 “O” Ring
39 Seal
Direction for sizing
2
7
Valve Piston
Upper Gland
Figure 7
25. Place the (12) lower washer over the (11) extension rod.
26. Pull the (11) extension rod up and grasp with two fingers, (see
figure 8).
37 Washer
11 Extension Rod
35 Head Assembly
Figure 8
PN 97999-868
66523-B (en)
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